Exact Chronology of Early Societies (ECHOES) is a 5-year project based at the University of Groningen. The phenomenon it seeks to investigate is large cosmic radiation strikes on the Earth. These radiation impacts, often known as Miyake Events (MEs), are both a threat and potentially a benefit to society as a whole. The events cause production of the isotope radiocarbon to increase dramatically in the atmosphere and, through photosynthesis, these enriched levels are incorporated by growing trees. Moreover, archives of wood exist within which the age of each tree-ring is precisely known, so the spikes in radiocarbon concentration can be dated to the exact year. The four discovered so far happened in 775, 994 and 1218 CE and in 3372 BCE. Such intense radiation strikes pose a threat to modern society as they would likely damage satellite and telecommunication systems. ECHOES aims to detect more of these MEs and to determine whether there is any pattern to their occurrence, so future communication networks can be safeguarded. Furthermore, the fact these events leave distinct radiocarbon signatures in contemporaneous plant material, and that the years of their occurrence are easily determined, mean they also offer the tantalising prospect of exact-year archaeological dating. By finding an ME in an old wooden artefact, for example, and matching its radiocarbon signature with one in the known-age archive, it should be possible to date that object to the exact year. ECHOES aims to make a number of these matches, and then use them to anchor the timelines of early civilisations such as the Maya and the Egyptians.